Riboflavin-Sensitized Photo-Acceleration of Food-Grade Genipin Coloration: Kinetic Insights, Mechanistic Analysis, and Application in Rapid Hair Coloration

This study explores the use of riboflavin-sensitized photo-acceleration to enhance the formation of genipin-based pigments for hair dyeing. By employing blue-light irradiation, the researchers significantly reduced the reaction time by 80% and confirmed the mechanism involves reactive oxygen species (ROS) generation. The resulting pigments, characterized by a blue chromophore at 590 nm, were applied to hair fibers, achieving commercial-level color with enhanced gloss and minimal cuticle disruption. The color demonstrated excellent stability, retaining its intensity after 20 washes. This method offers a safer, eco-friendly alternative to traditional hair dyes, addressing the need for sustainable and less irritating hair coloration solutions.